Why does a skier wear polarized glasses instead of glasses that are used for reading?
a)polarized glasses increase the brightness of light compared to regular glasses.
b)polarized glasses enhance the sharpness of objects compared to regular glasses.
c)polarized glasses are less expensive than regular glasses.
d)polarized glasses decrease reflected glare compared to regular glasses.

If the force on an object is in the negative direction, the work it does on the object must be [2 points a) negative. b) positive c) the work could be either positive or negative, depending on the direction the object moves

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.